Temperature control



Jan.- 6, 1931. c. J. SCANLAN TEMPERATURE CONTROL Filed March 25, 1929 2Sheets-Sheet l a 9 c. J. SCANLAN 1,788,067

TEMPERATURE CONTROL Filed March 25, 1929 2 Sheets-Sheet 2 UNIE CHESTERJ. SCANLAN, or BLOOMINGTON, ILLINQIS,-ASSIGN'OR To AME ICAN roimnnir' &FURNACE COMPANY, or BLooMINGToN, ILLINOIS, A oonrone'rrotr orILLINo sTEMPERATURE'CONTROL Application filed March 25, 1929. SerialNo.,349,52a.

This invention relates to the distribution, from a common source, of airor gas through pipes to remote locations, and also where it is desiredto use a centrifugal fan to accelerate air delivery through a duct orpipe.

This invention has utility in its application to warm air heatinginstallations in'buildings of different kinds. It may be applied for thepurpose of increasing the speed of lo the air and hence the volume ofthe air thru any particular pipe to which it is applied.

The motor may be started and the fan begun to operate by manuallyoperating an ordinary'electric switch, or, through the use of 1;; anelectric thermostat. The fan may be antomatically started whenever thetemperature falls below a given point and stopped automatically when thetemperature has reached the predetermined point. This presupposesacontinuous source of heat connected at the pipe in question.

Referring to the drawings:

Fig. 1 is a fragmentary view of a building showing features of theinvention incorporated therewith;

Fig. 2 is a detail view on an enlarged scale on the line II-II, Fig. l;

Fig. 3 is a section on the line III-III, Fig. 1;

Fig. 4 is a view looking into a different type of elbow device forpromoting air flow hereunder;

Fig. 5 is a plan view of the device of Fig. 4; and

Fig. 6 is a section on the l1ne VI.VI, Fig. 1, looking in the directionof the arrow.

On basement floor 1 there isshown a furnace having combustion chamber 2.Fire door damper 3 and ash pit damper 4 permit intake of combustionpromoting air to pass with the products of combustion up flue 5 fordischarge at chimney 6. An entirely independent air flow system isinvolved in heating the building herein. From room 7 there is shown coldair register 8 having communication by duct 9 and box 10 to jacket 11about the combustion chamber and furnace 2 in the main housing 12 ofthis furnace.

This jacket 11 has dome or top portlon 13 from which extend branches 14,15, 16,150

different remote places. The duct 14 extends to warm air register 17 inthe room 7 The duct 15 is shown as extending to port 18 (Fig. 3) atscroll19 inbox 20 as an elbow or boot. In this box 20'is locatedcentrifugal.

fan 21 for operation by motor 22, the control of which is from switch 23in room 24.. The.

operation of this fan 21 creates a pull on the warm air in the branch 15out of proportion to the normal flow from the jacket 11 and pushes suchfrom the scroll 19 up rectangular inter-wall duct 25 to warm airregister 26-;

in the room 24..

Instead of this scroll type with riser therefrom in the box 20 as'anelbow fitting in a Y branch, there maybea supply line (Figs.

4. 5,) entering box 27 through intake port ,1

28. Air thus supplied maybe acted upon by fan 21 driven by motor 22.Herein, the

delivery via horizontal elbow' may. be to.

duct 29. It is accordingly seen that in this elbow assembly there may belocation of the 'shown adjustable thermostat device 36 connected forcutting in motor 22 at the housing 31. In addition to the automaticcontrol 36, there may be alternatively used manual control switch 37 forcutting out the thermostatic control 36. This motor 22 is provided withthe fan 21 in eflt'set 38 from the housing 31. This oifset 38 isprovided with pin or bearing 39 having vane portion 40. Between thisbearing 39 and the port 30 there is, from the housing 31, port 41axially to the fan 21. The position of the vane 40 is normally at seat.42 for the straight-away gravity or normal draft air flow from the port30 past the port 32.

However, as there may be occasion in room 35 for increased delivery ofwarm air from the furnace, the thermostat 36 may automatically cut inthe motor 22, thereby at once starting the fan\21. This means that airas supplied from duct 16 through the port 30 into the housing 31 isdrawn into the port l1 and centrifugally, by the scroll 19, deliveredfrom the fan 21 against the vane 40 as at the seat 42, at once swingingsuch vane into position transversely of the housing 30 for thisacceleratedfiraft flow as a positive stream entering the port 30 to thehousing 31, thence by port 41 through the fan 21 and past the seat 42again to the housing 31 on the opposite side of the vane 40 with flowthrough the port 32 into the duct 33. a

In the installation as herein disclosed, there is a flexibility fordefinite control even under greatlymnbalanced weather conditions as towind or temperature. This makes possible even with the delicateinstallations as so sensitive for heating disturbance as warm airsystems that the requirements may be accurately given response manuallyor automatically, and that even with such installations there may beretained gravity condition without acceleration, for each of thelocations, or any certain one thereof. It is thus seen that gravity flowmay be through each of the branches. The circuit is independent of thatof the combustion region.

The heating is herein shown as direct from the conductivity of thecombustion chamber instead of indirect from steam coils or hot watercoils, although such may be supplemental means for the branch orbranches. This special acceleration as in a branch independently ofdisturbance in other branches, permits the placing of the quantities ofwarmed gas or air on the windward side when the leeward side may beamply warm. It also will permit an abnormal rise in a special room asthat for children, dressing room, sickroom or bathroom. This simpledevice is readily installed in old installations or incorporated in'newinstallations; makes the installation one of a'maximum degree offlexibility for accurate temperature 'response.

The flexibility of this device is one which permits ready inclusion in aplant having an installation, whether with cylindrical or rectangularpipes. The adaptor fitting 29, such as shown in Fig. 4, may be attachedsay to the port 18 in Fig. 3 device for rectangular pipe assembly eachWay, or this fitting may be on each side in the device of Fig. 5 orother pipe in the system where it is desired to have such adapted tomeet the requirements of the duct as to the intermediate region. It isaccordingly seen that this device with a motor outside the pipe andaccordingly not exposed to the deleterious action of the temperature maybe installed to promote draft flow in the wide variety of requirementswhether for a rectangular-horizontal to cylindrical-vertical; acylindrical horizontal to a rectangular-vertical, whether right angleelbow or left angle elbow; whether in a plane or vertical or evenstraight away. I

What is claimed and it is desired to secure by United States LettersPatent is:

1. In an air distribution system embody.-

ing a plurality of branches, a branch duct -flow laterally of the fan,said housing providing a Way of greater cross sectional extent than saidfan extent.

2. In an'air distribution system embodying a plurality of branches, abranch duct providing a gravity air flow normal clearway, and an aircirculation booster fitting therefor comprising a housing, a fan in andof minor extent as to said housing, said housing having an axial intakeport opposing the fan of greater cross-sectional area than the fanextent, a motor drive for the fan exterior of the housing opposite theintake, said housing having a delivery port for tangential air flowlaterally of the fan, said housing providing a way of greater crosssectional extent than said fan extent, and a vane in said housing inidle position of the fan closing said delivery port to leave clearwaythrough the housing independently of past said fan, said vane on fanoperation being swingable to open said delivery port and direct air flowto said In-

